Visual Elements Rule of Thirds 1.06 While the preferred size of the logo is the width of the far right column, exceptions may be made in selected circumstances— particularly in digital formats. If the logo is illegible when sized at one third of the grid, it should be enlarged to two thirds. If it is still illegible, it can be further enlarged to the full width of the grid. If the horizontal logo is difficult to read even at full width (specifically in skinny vertical units), the stacked logo may be used. If the horizontal dimension of the ad unit is much larger than the vertical Two - Thirds Full Width dimension, and applying the rule of thirds will cause the logo to interfere with other elements of the layout, it is permissible to reduce the logo to one fourth of the horizontal space. Stacked One -Fourth Exception © American Airlines, 2015 Advertising Guidelines, v 3.0